Based on fractional Brownian motion (fBm) simulations of three-dimensional gas density and velocity fields, we present a study of the statistical properties of spectroimagery observations (channel maps, integrated emission, and line centroid velocity) in the case of an optically thin medium at various temperatures. The power spectral index W of the integrated emission is confirmed to be that of...

One hundred and forty two neurons in V1 and V2 were quantitatively tested using a multihistogram technique in paralyzed and anesthetized macaque monkeys. V1 neurons with receptive fields within 2 degrees from the fixation point (central V1 sample) and V1 neurons with eccentric receptive fields (15-25 degrees eccentricity, peripheral V1 sample) were compared to assess changes in velocity sensiti...